Canvas tutorial

Hello, this is ГФ.Now that we have the outline of the manga, I imagine that everyone is anxious to start drawing the work. However, before that, I think it is necessary to corroborate some very important points, because if we leave them aside, it is possible that we will spoil the work we have done with so much effort.Additionally, I will refer to two aspects of special importance when making manga in an application or digital program: the “grayscale” and the “monochrome mode”.Click Here for Previous Tutorials.Manga Tutorial for Beginners 01 Process of Manga MakingManga Tutorial for Beginners 02 Let’s Make Outline (Part 1)Manga Tutorial for Beginners 03 Let’s Make Outline (Part 2)Manga Tutorial for Beginners 04 Get Ready to Draw Manga with MediBang Paint!Manga Tutorial for Beginners 05 Let’s Make Name(outline)Manga Tutorial for Beginners 06 Let’s think about frame layout and screen.Manga Tutorial for Beginners 07 Considerations when setting up the canvas.When it comes to manga to be shared only on the web, there are no rules to follow regarding the size or margins of the paper or canvas. However, in the case of contests or doujinshi, there are requirements regarding the size of the canvas. Likewise, there are rules regarding the margins and spaces to be left blank. So, let’s see what the general rules are.Before I start with the explanation, I just want to clarify that I will mention here the rules that apply in Japan.1. Paper or canvas size2. About guide lines3. About the binding margin.4.

Silhouette paintings are one of the easiest (end enjoyable) painting projects for beginners. Paired with sweet couples art, this step by step painting tutorial can be used for date night, craft night or even a special gift idea.In this tutorial you’ll learn just how easy it is to create a trending “day & night” split canvas artwork, with both a sunset and a night sky. You can then zen out and trace then fill in the the silhouette couple sitting on a pier and city skyline using the FREE traceable stencil (download below). Active Time 1 hour Total Time 1 hour Difficulty Beginner Materials 10x10 heart or square canvas, 9x12 canvas White acrylic craft paint black paint neon pink paint yellow paint blue paint Q-tips: 1/2" wide brush small detailing brush (size 1 ) Hair Dryer (optional) Instructions Watch the video tutorial herePut a piece of masking tape down the centre of your canvas (square, rectangular or heart shaped. Then paint a sunset sky on the right side of your canvas. Use white in the middle, then blend in yellow above the white using horizontal back and forth strokes. Above the yellow blend in neon pink. Then make a mix of blue and neon pink to make a purple. Blend in the purple above the neon pink on your canvas. Finally finish with blending in a black at the top. Blend in yellow, pink, purple starting at the center downwards (for the reflection of the sunset in the water). The most important thing here is to use those back and forth strokes to blend each color smoothly. Dry this layer with a hairdryer or leave to air dryPeel the tape off, and shift it over to the right. Now you're going to paint in the night sky. Use the same

The image looks good on the screen, if the dots that make up the halftone screen are distorted, when the image is printed it will generate the “moiré” effect. To avoid this, try from the beginning to set up the canvas according to the final print size, and try not to enlarge or shrink the images where we have applied raster.From the next lesson, we will begin to enter fully into the process of drawing manga in monochrome mode.The topic of the next lesson will be “vignette frames and text balloons” See you!”Click Here for Previous Tutorials.Manga Tutorial for Beginners 01 Process of Manga MakingManga Tutorial for Beginners 02 Let’s Make Outline (Part 1)Manga Tutorial for Beginners 03 Let’s Make Outline (Part 2)Manga Tutorial for Beginners 04 Get Ready to Draw Manga with MediBang Paint!Manga Tutorial for Beginners 05 Let’s Make Name(outline)Manga Tutorial for Beginners 06 Let’s think about frame layout and screen.Manga Tutorial for Beginners 07 Considerations when setting up the canvas.「ГФ」ART streetClick here for the collection： can read my manga here → is also a manga that I draw under a different name. →

一、canvas 简介​ 是 HTML5 新增的，一个可以使用脚本(通常为 JavaScript) 在其中绘制图像的 HTML 元素。它可以用来制作照片集或者制作简单(也不是那么简单)的动画，甚至可以进行实时视频处理和渲染。​它最初由苹果内部使用自己 MacOS X WebKit 推出，供应用程序使用像仪表盘的构件和 Safari 浏览器使用。后来，有人通过 Gecko 内核的浏览器 (尤其是 Mozilla和Firefox)，Opera 和 Chrome 和超文本网络应用技术工作组建议为下一代的网络技术使用该元素。​Canvas 是由 HTML 代码配合高度和宽度属性而定义出的可绘制区域。JavaScript 代码可以访问该区域，类似于其他通用的二维 API，通过一套完整的绘图函数来动态生成图形。​ Mozilla 程序从 Gecko 1.8 (Firefox 1.5) 开始支持 , Internet Explorer 从 IE9 开始 。Chrome 和 Opera 9+ 也支持 。二、Canvas基本使用2.1 元素​ 看起来和 标签一样，只是 只有两个可选的属性 width、heigth 属性，而没有 src、alt 属性。​如果不给 设置 widht、height 属性时，则默认 width为300、height 为 150，单位都是 px。也可以使用 css 属性来设置宽高，但是如宽高属性和初始比例不一致，他会出现扭曲。所以，建议永远不要使用 css 属性来设置 的宽高。替换内容​由于某些较老的浏览器（尤其是 IE9 之前的 IE 浏览器）或者浏览器不支持 HTML 元素 ，在这些浏览器上你应该总是能展示替代内容。​支持 的浏览器会只渲染 标签，而忽略其中的替代内容。不支持 的浏览器则 会直接渲染替代内容。用文本替换： 你的浏览器不支持 canvas，请升级你的浏览器。用 替换： 结束标签 不可省略。与 元素不同， 元素需要结束标签()。如果结束标签不存在，则文档的其余部分会被认为是替代内容，将不会显示出来。2.2 渲染上下文(Thre Rending Context)​ 会创建一个固定大小的画布，会公开一个或多个渲染上下文(画笔)，使用渲染上下文来绘制和处理要展示的内容。​ 我们重点研究 2D 渲染上下文。 其他的上下文我们暂不研究，比如， WebGL 使用了基于 OpenGL ES的3D 上下文 ("experimental-webgl") 。var canvas = document.getElementById('tutorial');//获得 2d 上下文对象var ctx = canvas.getContext('2d');2.3 检测支持性var canvas = document.getElementById('tutorial');if (canvas.getContext){ var ctx = canvas.getContext('2d'); // drawing code here} else { // canvas-unsupported code here}2.4 代码模板实例canvas id="tutorial" width="300" height="300">canvas>script type="text/javascript">function draw(){ var canvas = document.getElementById('tutorial'); if(!canvas.getContext) return; var ctx = canvas.getContext("2d"); //开始代码 }draw();script>尝试一下 »2.5 一个简单的例子以下实例绘制两个长方形：实例canvas id="tutorial" width="300" height="300">canvas>script type="text/javascript">function draw(){ var canvas = document.getElementById('tutorial'); if(!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.fillStyle = "rgb(200,0,0)"; //绘制矩形 ctx.fillRect (10, 10, 55, 50); ctx.fillStyle = "rgba(0, 0, 200, 0.5)"; ctx.fillRect (30, 30, 55, 50);}draw();script>尝试一下 »三、绘制形状3.1 栅格 (grid) 和坐标空间​如下图所示，canvas 元素默认被网格所覆盖。通常来说网格中的一个单元相当于 canvas 元素中的一像素。栅格的起点为左上角，坐标为 (0,0) 。所有元素的位置都相对于原点来定位。所以图中蓝色方形左上角的坐标为距离左边（X 轴）x 像素，距离上边（Y 轴）y 像素，坐标为 (x,y)。​后面我们会涉及到坐标原点的平移、网格的旋转以及缩放等。3.2 绘制矩形​ 只支持一种原生的图形绘制：矩形。所有其他图形都至少需要生成一种路径 (path)。不过，我们拥有众多路径生成的方法让复杂图形的绘制成为了可能。canvast 提供了三种方法绘制矩形：1、fillRect(x, y, width, height)：绘制一个填充的矩形。2、strokeRect(x, y, width, height)：绘制一个矩形的边框。3、clearRect(x, y, widh, height)：清除指定的矩形区域，然后这块区域会变的完全透明。说明：这 3 个方法具有相同的参数。x, y：指的是矩形的左上角的坐标。(相对于canvas的坐标原点)width, height：指的是绘制的矩形的宽和高。function draw(){ var canvas = document.getElementById('tutorial'); if(!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.fillRect(10, 10, 100, 50); ctx.strokeRect(10, 70, 100, 50); }draw();ctx.clearRect(15, 15, 50, 25);四、绘制路径 (path)图形的基本元素是路径。路径是通过不同颜色和宽度的线段或曲线相连形成的不同形状的点的集合。一个路径，甚至一个子路径，都是闭合的。使用路径绘制图形需要一些额外的步骤：创建路径起始点调用绘制方法去绘制出路径把路径封闭一旦路径生成，通过描边或填充路径区域来渲染图形。下面是需要用到的方法：beginPath()新建一条路径，路径一旦创建成功，图形绘制命令被指向到路径上生成路径moveTo(x, y)把画笔移动到指定的坐标(x, y)。相当于设置路径的起始点坐标。closePath()闭合路径之后，图形绘制命令又重新指向到上下文中stroke()通过线条来绘制图形轮廓fill()通过填充路径的内容区域生成实心的图形4.1 绘制线段function draw(){ var canvas = document.getElementById('tutorial'); if (!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.moveTo(50, 50); ctx.lineTo(200, 50); ctx.closePath(); ctx.stroke(); }draw();4.2 绘制三角形边框function draw(){ var canvas = document.getElementById('tutorial'); if (!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.moveTo(50, 50); ctx.lineTo(200, 50); ctx.lineTo(200, 200); ctx.closePath(); ctx.stroke(); }draw();4.3 填充三角形function draw(){ var canvas = document.getElementById('tutorial'); if (!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.moveTo(50, 50); ctx.lineTo(200, 50); ctx.lineTo(200, 200); ctx.fill(); }draw();4.4 绘制圆弧有两个方法可以绘制圆弧：1、arc(x, y, r, startAngle, endAngle, anticlockwise): 以(x, y) 为圆心，以r 为半径，从 startAngle 弧度开始到endAngle弧度结束。anticlosewise 是布尔值，true 表示逆时针，false 表示顺时针(默认是顺时针)。注意：这里的度数都是弧度。0 弧度是指的 x 轴正方向。radians=(Math.PI/180)*degrees //角度转换成弧度2、arcTo(x1, y1, x2, y2, radius): 根据给定的控制点和半径画一段圆弧，最后再以直线连接两个控制点。圆弧案例 1function draw(){ var canvas = document.getElementById('tutorial'); if (!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.arc(50, 50, 40, 0, Math.PI / 2, false); ctx.stroke();}draw();圆弧案例 2function draw(){ var canvas = document.getElementById('tutorial'); if (!canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.arc(50, 50, 40, 0, Math.PI / 2, false); ctx.stroke(); ctx.beginPath(); ctx.arc(150, 50, 40, 0, -Math.PI / 2, true); ctx.closePath(); ctx.stroke(); ctx.beginPath(); ctx.arc(50, 150, 40, -Math.PI / 2, Math.PI / 2, false); ctx.fill(); ctx.beginPath(); ctx.arc(150, 150,

Get the Tutorial 22 hearthandvine.com Colorful Magnetic Clothespins This simple tutorial will show you how to make colorful magnetic clothespins to use on your fridge or command center. They're also a cute DIY gift idea. Get the Tutorial 23 Glue Pictures on Canvas Learn how to glue pictures on canvas with Mod Podge! This is a great project for instant decor. Get the Tutorial 24 Jessica Anderson Stamping on Tea Towels Use a fun fruit stamping technique to decorate some plain tea towels. These make great gifts and they are so easy – even a kid can make them! Get the Tutorial 25 Aki Altuna DIY Bulletin Board Looking for a DIY bulletin board idea that takes about ten minutes? This is just the project for you! It’s really simple to do and is budget friendly. Get the Tutorial 26 Steve Carrell Make a Felt Ball Garland the Easy Way Don’t buy a felt ball garland when they are SO simple to make! Use felt balls and embroidery floss to add colorful and fun to an unexpected spot in your home.PS – if you like pom poms, you can also get a pom pom garland tutorial. It's just as easy! Get the Tutorial 27 Pretty Life Girls Tie Dye Headbands from T-Shirts These DIY tie dye headbands are easy to make from t-shirts and look great! Both kids and adults will love this fashion craft. Make for spring or summer using one of these three methods! Get the Tutorial 28

Line. Here is an example :Output : Line Cap var canvas = document.getElementById('DemoCanvas');if (canvas.getContext) { var context = canvas.getContext("2d"); // butt line cap (first line) context.beginPath(); context.moveTo(20,20); context.lineTo(20,200); context.lineWidth = 25; context.strokeStyle = '#ff0000'; context.lineCap = 'butt'; context.stroke(); // round line cap (second line) context.beginPath(); context.moveTo(80,20); context.lineTo(80,200); context.lineWidth = 25; context.strokeStyle = '#ff0000'; context.lineCap = 'round'; context.stroke(); // square line cap (third line) context.beginPath(); context.moveTo(120,20); context.lineTo(120,200); context.lineWidth = 25; context.strokeStyle = '#ff0000'; context.lineCap = 'square'; context.stroke();} Live Demo --> Line Join lineJoin property is used to get or set the type of corner that is created when two lines join. There are three values : bevel : A filled triangle connects the two lines that are joined, creating a beveled corner. round : Lines join with a rounded corner. square : Default. Lines join with a smoothly mitered corner. Here is an example : Output : Line Joining var canvas = document.getElementById('DemoCanvas');if (canvas.getContext) { var ctx = canvas.getContext("2d"); var lStart = 50; var lEnd = 200; var yStart = 20; ctx.beginPath(); ctx.lineWidth = 25;// Use a bevel corner. ctx.lineJoin = "bevel"; ctx.moveTo(50, 20); ctx.lineTo(150, 20); ctx.lineTo(150, 120); ctx.stroke();// Use a round corner. ctx.beginPath(); ctx.lineJoin = "round"; ctx.moveTo(50, 140); ctx.lineTo(150, 140); ctx.lineTo(150, 260); ctx.stroke();// Use a miter. ctx.beginPath(); ctx.lineJoin = "miter"; ctx.moveTo(50, 280); ctx.lineTo(150, 280); ctx.lineTo(150, 400); ctx.stroke(); } Live Demo --> See the Pen html css common editorby w3resource (@w3resource) on CodePen. Previous: HTML5 Canvas Tutorial Next: HTML5 Canvas arcs tutorial